Untreated wastewater tanks at the Fukushima nuclear power plant, Japan. (Photo: AFP/VNA)

Tokyo Electric Power Company Holdings Inc. (TEPCO) said it plans to discharge 7,800 tons of water through June 4, after confirming that the radioactivity levels meet both its own and the government's standards.

Since the operation began on Aug. 24 last year, about 39,000 tons of treated water have been released over five previous rounds.

The utility plans to discharge a total of about 54,600 tons on seven occasions this fiscal year, which started in April.

During the release of the previous five batches, TEPCO said it detected up to 29 becquerels of radioactive tritium per liter of seawater in samples taken from areas near the power complex, well below the World Health Organization's limit of 10,000 becquerels for drinking water.